Ringing burglar-alarm



UNITED STATES PATENT UFFICE.

THOMAS E. JAMES, OF ROCHESTER, NEW YORK.

'RINGING BURGLAR-ALARM.

SPECIFICATION forming part bf Letters Patent NO. 277,738, dated May 15, 1883.

Application filed November 22, 1882. (N0 model.)

To all whom it may concern.-

Be it known that I, THOMAS E. JAMES, of Rochester, in the county of Monroe and State of New York, haveinvented a new and useful by the opening of the door to which it may be connected; and it consists in parts and their operations shown in drawings, and hereinbelow fully explained.

Referring to the drawings, Figure l is a front elevation of my improved burglar-alarm attached to the casing of a door in position to be operated by the latter; Fig. 2, a side elevation of the same, viewed as indicated by the arrow yin Fig. 1, the door and easing being sectioned on the dotted line a, and the case holding the alarm mechanism sectioned on the dotted line at in Fig. 1, Fig. 3, a view of the same, looking from above, as indicated by arrow 2 in Fig. 2, and showing, further, the manner in which the door operates the alarm.

Referring to the parts, A is a door, and B the inside casing of the same.

0 is a case or box, inclosin g the alarm mechanism, which may be made ornamental and of any style to suit the taste.

D is the alarm mechanism, which consists of the driving part b, hammer a, and gong d, that shown being the common alarm device used in clocks. The case 0, holding the alarm mechanism, is designed to be secured to the casing B onthe inside of the doorway at some convenient point up out of the way, as shown.

fis a separating-piece or separator, by means of which the hammer a of the alarm is held away from the gong, and while held away, as shown, the motion of the driving part b of the mechanism is stayed, and the alarm kept silent. The separator fis pivoted at its lower end between lugs e e, secured to the case (I, by means of which it may occupy a vertical position, as shown in full lines, or be displaced from be tween the hammer and gong by falling to a position shown in dotted lines in Fig. 2. If the spring of the driving part Z) be wound up and the separator withdrawn from between the hammer and gong by any means, the former isiinmediately set in motion by the force of. the spring and caused to strike the latter and sound an alarm. A spring-arm, c, is secured totheseparatorf, near its upper end, by means ot'a screw, 7;, and caused to project at right angles to said separator over the edge of the case (J, and in the way of the door A- as the latter is swung open. By means of the door coming in contact with the springarm o, as shown in dotted position in Fig. 3, the separatorf will be carried away from between the hammer and gong and the alarm will be set off.

When the alarm is not in use the spring-arm 0 may be swung around upon the pivot-screw i1, and caused to lie parallel with the separator, as shown in dotted position, wholly within the case 0. The upper end of the separator is of such a thickness as to enter easily be tween the hammer and gong when the former is lifted away from the latter by theQmechanism operating said hammer, and when the spring is wound up preparatory to setting the alarm, as above stated, it is allowed to act upon the hammer until the latter is raised from the gong sufficiently to permit the separator to be inserted between them for the purpose stated.

A simple cover for the case (not shown) protects the alarm mechanism from the dust, and from receiving injury from other causes, a slot being provided in the same, through which to allow of the separator to fall away from the gong, as above stated.

The arm cis purposely made to bend, so that should the door by accident be swung against it in the other direction while being closed it would yield and let the door pass, as shown in dotted position at s, Fig. 3, without injury to the alarm.

It willbe understood that myim proved alarm device herein described maybe easily attached to a window-sash by any person possessing ordinary ingenuity without further invention, so as to be operated by the raising of said sash.

It will be understood that the alarm-case 0 may be located at any convenient point near the door or window, or in an upper or distant room of the building, with a wire connection between said door or windowand the separatorf, so that the latter may be displaced, as

above described, when the door or window is door A, the alarm mechanism D, consisting of disturbed from without, causing the alarm to the driving part b,hamn1er a, and gong d, and

sound. the pivoted separator. f, for the hammer and Burglar-alarms consisting of a hammer and gong, provided with the adjustable spring-arm 5 gong, with actuating mechanism for the ham- 0, substantially as shown and described.

mer inclosed in a case or box and placed to be 1 w u n I set 111 motion by an opening door, are not new, JAMES" and such 1 do not claim, broadly. Witnesses:

I claim as my in"ention-- E. B. WHITMORE,

IO In a burglar-alarm,-in combination with the L. O. MGOONNELLJ 

